cregit-Linux how code gets into the kernel

Release 4.17 arch/arm/mach-ixp4xx/nas100d-setup.c

// SPDX-License-Identifier: GPL-2.0
/*
 * arch/arm/mach-ixp4xx/nas100d-setup.c
 *
 * NAS 100d board-setup
 *
 * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
 *
 * based on ixdp425-setup.c:
 *      Copyright (C) 2003-2004 MontaVista Software, Inc.
 * based on nas100d-power.c:
 *      Copyright (C) 2005 Tower Technologies
 * based on nas100d-io.c
 *      Copyright (C) 2004 Karen Spearel
 *
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 * Author: Rod Whitby <rod@whitby.id.au>
 * Maintainers: http://www.nslu2-linux.org/
 *
 */
#include <linux/gpio.h>
#include <linux/if_ether.h>
#include <linux/irq.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <linux/leds.h>
#include <linux/reboot.h>
#include <linux/i2c.h>
#include <linux/gpio/machine.h>
#include <linux/io.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/flash.h>


#define NAS100D_SDA_PIN		5

#define NAS100D_SCL_PIN		6

/* Buttons */

#define NAS100D_PB_GPIO         14   
/* power button */

#define NAS100D_RB_GPIO         4    
/* reset button */

/* Power control */

#define NAS100D_PO_GPIO         12   
/* power off */

/* LEDs */

#define NAS100D_LED_WLAN_GPIO	0

#define NAS100D_LED_DISK_GPIO	3

#define NAS100D_LED_PWR_GPIO	15


static struct flash_platform_data nas100d_flash_data = {
	.map_name		= "cfi_probe",
	.width			= 2,
};


static struct resource nas100d_flash_resource = {
	.flags			= IORESOURCE_MEM,
};


static struct platform_device nas100d_flash = {
	.name			= "IXP4XX-Flash",
	.id			= 0,
	.dev.platform_data	= &nas100d_flash_data,
	.num_resources		= 1,
	.resource		= &nas100d_flash_resource,
};


static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
	{
		I2C_BOARD_INFO("pcf8563", 0x51),
        },
};


static struct gpio_led nas100d_led_pins[] = {
	{
		.name		= "nas100d:green:wlan",
		.gpio		= NAS100D_LED_WLAN_GPIO,
		.active_low	= true,
        },
	{
		.name		= "nas100d:blue:power",  /* (off=flashing) */
		.gpio		= NAS100D_LED_PWR_GPIO,
		.active_low	= true,
        },
	{
		.name		= "nas100d:yellow:disk",
		.gpio		= NAS100D_LED_DISK_GPIO,
		.active_low	= true,
        },
};


static struct gpio_led_platform_data nas100d_led_data = {
	.num_leds		= ARRAY_SIZE(nas100d_led_pins),
	.leds			= nas100d_led_pins,
};


static struct platform_device nas100d_leds = {
	.name			= "leds-gpio",
	.id			= -1,
	.dev.platform_data	= &nas100d_led_data,
};


static struct gpiod_lookup_table nas100d_i2c_gpiod_table = {
	.dev_id		= "i2c-gpio.0",
	.table		= {
		GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SDA_PIN,
				NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
		GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SCL_PIN,
				NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
        },
};


static struct platform_device nas100d_i2c_gpio = {
	.name			= "i2c-gpio",
	.id			= 0,
	.dev	 = {
		.platform_data	= NULL,
        },
};


static struct resource nas100d_uart_resources[] = {
	{
		.start		= IXP4XX_UART1_BASE_PHYS,
		.end		= IXP4XX_UART1_BASE_PHYS + 0x0fff,
		.flags		= IORESOURCE_MEM,
        },
	{
		.start		= IXP4XX_UART2_BASE_PHYS,
		.end		= IXP4XX_UART2_BASE_PHYS + 0x0fff,
		.flags		= IORESOURCE_MEM,
        }
};


static struct plat_serial8250_port nas100d_uart_data[] = {
	{
		.mapbase	= IXP4XX_UART1_BASE_PHYS,
		.membase	= (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
		.irq		= IRQ_IXP4XX_UART1,
		.flags		= UPF_BOOT_AUTOCONF,
		.iotype		= UPIO_MEM,
		.regshift	= 2,
		.uartclk	= IXP4XX_UART_XTAL,
        },
	{
		.mapbase	= IXP4XX_UART2_BASE_PHYS,
		.membase	= (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
		.irq		= IRQ_IXP4XX_UART2,
		.flags		= UPF_BOOT_AUTOCONF,
		.iotype		= UPIO_MEM,
		.regshift	= 2,
		.uartclk	= IXP4XX_UART_XTAL,
        },
	{ }
};


static struct platform_device nas100d_uart = {
	.name			= "serial8250",
	.id			= PLAT8250_DEV_PLATFORM,
	.dev.platform_data	= nas100d_uart_data,
	.num_resources		= 2,
	.resource		= nas100d_uart_resources,
};

/* Built-in 10/100 Ethernet MAC interfaces */

static struct eth_plat_info nas100d_plat_eth[] = {
	{
		.phy		= 0,
		.rxq		= 3,
		.txreadyq	= 20,
        }
};


static struct platform_device nas100d_eth[] = {
	{
		.name			= "ixp4xx_eth",
		.id			= IXP4XX_ETH_NPEB,
		.dev.platform_data	= nas100d_plat_eth,
        }
};


static struct platform_device *nas100d_devices[] __initdata = {
	&nas100d_i2c_gpio,
	&nas100d_flash,
	&nas100d_leds,
	&nas100d_eth[0],
};


static void nas100d_power_off(void) { /* This causes the box to drop the power and go dead. */ /* enable the pwr cntl gpio and assert power off */ gpio_direction_output(NAS100D_PO_GPIO, 1); }

Contributors

PersonTokensPropCommitsCommitProp
Rod Whitby1482.35%150.00%
Linus Walleij317.65%150.00%
Total17100.00%2100.00%

/* This is used to make sure the power-button pusher is serious. The button * must be held until the value of this counter reaches zero. */ static int power_button_countdown; /* Must hold the button down for at least this many counts to be processed */ #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */ static void nas100d_power_handler(struct timer_list *unused); static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler);
static void nas100d_power_handler(struct timer_list *unused) { /* This routine is called twice per second to check the * state of the power button. */ if (gpio_get_value(NAS100D_PB_GPIO)) { /* IO Pin is 1 (button pushed) */ if (power_button_countdown > 0) power_button_countdown--; } else { /* Done on button release, to allow for auto-power-on mods. */ if (power_button_countdown == 0) { /* Signal init to do the ctrlaltdel action, * this will bypass init if it hasn't started * and do a kernel_restart. */ ctrl_alt_del(); /* Change the state of the power LED to "blink" */ gpio_set_value(NAS100D_LED_PWR_GPIO, 0); } else { power_button_countdown = PBUTTON_HOLDDOWN_COUNT; } } mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500)); }

Contributors

PersonTokensPropCommitsCommitProp
Rod Whitby6992.00%133.33%
Kees Cook45.33%133.33%
Linus Walleij22.67%133.33%
Total75100.00%3100.00%


static irqreturn_t nas100d_reset_handler(int irq, void *dev_id) { /* This is the paper-clip reset, it shuts the machine down directly. */ machine_power_off(); return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Rod Whitby20100.00%1100.00%
Total20100.00%1100.00%


static int __init nas100d_gpio_init(void) { if (!machine_is_nas100d()) return 0; /* * The power button on the Iomega NAS100d is on GPIO 14, but * it cannot handle interrupts on that GPIO line. So we'll * have to poll it with a kernel timer. */ /* Request the power off GPIO */ gpio_request(NAS100D_PO_GPIO, "power off"); /* Make sure that the power button GPIO is set up as an input */ gpio_request(NAS100D_PB_GPIO, "power button"); gpio_direction_input(NAS100D_PB_GPIO); /* Set the initial value for the power button IRQ handler */ power_button_countdown = PBUTTON_HOLDDOWN_COUNT; mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Walleij61100.00%1100.00%
Total61100.00%1100.00%

device_initcall(nas100d_gpio_init);
static void __init nas100d_init(void) { uint8_t __iomem *f; int i; ixp4xx_sys_init(); /* gpio 14 and 15 are _not_ clocks */ *IXP4XX_GPIO_GPCLKR = 0; nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0); nas100d_flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1; gpiod_add_lookup_table(&nas100d_i2c_gpiod_table); i2c_register_board_info(0, nas100d_i2c_board_info, ARRAY_SIZE(nas100d_i2c_board_info)); /* * This is only useful on a modified machine, but it is valuable * to have it first in order to see debug messages, and so that * it does *not* get removed if platform_add_devices fails! */ (void)platform_device_register(&nas100d_uart); platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices)); pm_power_off = nas100d_power_off; if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler, IRQF_TRIGGER_LOW, "NAS100D reset button", NULL) < 0) { printk(KERN_DEBUG "Reset Button IRQ %d not available\n", gpio_to_irq(NAS100D_RB_GPIO)); } /* * Map in a portion of the flash and read the MAC address. * Since it is stored in BE in the flash itself, we need to * byteswap it if we're in LE mode. */ f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000); if (f) { for (i = 0; i < 6; i++) #ifdef __ARMEB__ nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i); #else nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3)); #endif iounmap(f); } printk(KERN_INFO "NAS100D: Using MAC address %pM for port 0\n", nas100d_plat_eth[0].hwaddr); }

Contributors

PersonTokensPropCommitsCommitProp
Rod Whitby18783.86%550.00%
Deepak Saxena229.87%110.00%
Alessandro Zummo62.69%110.00%
Linus Walleij62.69%110.00%
Johannes Berg10.45%110.00%
Michael-Luke Jones10.45%110.00%
Total223100.00%10100.00%

MACHINE_START(NAS100D, "Iomega NAS 100d") /* Maintainer: www.nslu2-linux.org */ .atag_offset = 0x100, .map_io = ixp4xx_map_io, .init_early = ixp4xx_init_early, .init_irq = ixp4xx_init_irq, .init_time = ixp4xx_timer_init, .init_machine = nas100d_init, #if defined(CONFIG_PCI) .dma_zone_size = SZ_64M, #endif .restart = ixp4xx_restart, MACHINE_END

Overall Contributors

PersonTokensPropCommitsCommitProp
Rod Whitby85078.12%725.00%
Linus Walleij11410.48%414.29%
Krzysztof Hałasa383.49%13.57%
Deepak Saxena222.02%13.57%
Nico Pitre151.38%27.14%
Russell King121.10%310.71%
Michael-Luke Jones90.83%27.14%
Kees Cook80.74%13.57%
Alessandro Zummo60.55%13.57%
Rob Herring50.46%13.57%
Richard Purdie40.37%13.57%
Stephen Warren20.18%13.57%
Greg Kroah-Hartman10.09%13.57%
Johannes Berg10.09%13.57%
Jean Delvare10.09%13.57%
Total1088100.00%28100.00%
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